OsiSense XS - studiecd.dk

Approach according to EN/ISO 13849-1Determination of the Performance Level requested (PLr)Requiredperformancelevel PLrDone using the risk graphic oppositeS = Severity of injuryS1 = Slight (normally reversible injury)S2 = Serious (normally irreversible) injury including deathF = Frequency and/or exposure time to the hazardF1 = Seldom to less often and/or the exposure time is shortF2 = Frequent to continuous and/or the exposure time is longP = Possibility of avoiding the hazard or limiting the harmP1 = Possible under specific conditionsP2 = Scarcely possibleL = Low contribution to risk reductionH = High contribution to risk reductionStarting point forthe evaluation of thecontribution to therisk reduction of asafety function123Determination of the PL achieved by theSafety-related parts of control systems (SRP/CS)According to standard EN/ISO 13849-1,the Performance level (PL) is linked to a targetfailure value of probability of dangerous failureper hour for each safety related control function.Performancelevel (PL)abcdeProbability of a dangerousFailure per Hour10 -5 ... < 10 -43 x 10 -6 ...